Unless you can provide a very close up image, it’s impossible to say
for sure. Some of the outermost stones appear to be flush set, but
where they are grouped tightly, it may be classical pave. This is not
a technique for a beginner, although Blaine Lewis teaches it at New
Approach, and I don’t think he’d care if you’d ever set a stone
before, he’d get you going on it. It’s even possible that this piece
was stone-in-place cast, but again, without an extreme close-up, it’s
hard to say. The term, “caviar cluster” is not a standard stone
setter’s terminology, it’s a marketing term, probably made up for
this specific manufacturer.